How do you conclude Libertarianism leads to global communism? Libertarian by common definition is deregulation, small government, more freedom. That is literally the anti-thesis to the common definition of communism. Which has big government, strong regulations, and less freedom to maintain fairness. In a Libertarian society, the concept of "equality" doesn't exist, since its more survival of the fittest.
Ok, let's go step by step.
1. Deregulation creates more freedom to the owner of the business
2. Business owner wants to maximize profit on the free market
3. The best way to do that is through lower wages and cutting regulations
4. Business owner quickly realizes that such workforce is almost in the endless supply outside of USA
5. Big business owners start to fund campaigns to various politician that will ease the whole process of exporting manufacture
6. Large and medium manufacture starts to shift overseas where people do the same thing for 5% of the price, plus they can't protest since they live in open dictatorship
7. The working/middle class starts to experience difficulties in affording life
8. As the "new free market" settles in the authoritarian governments have greatly increased income and even those that don't want to move factories overseas must since the wage difference is too big. Those that don't move will go bankrupt.
9. As USA loses it's manufacture it shifts the global center of power. Since all the countries that were dependent on US for specialized goods now depend on places like China and it's satellites. Especially since China with the huge profits managed to make it's own manufacturing base instead of just hosting US companies.
10. China Starts to buy assets and stocks in USA, as well as giving loans to the government.
11. Most of the population in USA is so crippled in financial sense that they demand more benefits just to survive.
12. Without any barriers China and similar countries start to openly buy stuff in all the countries that were previously dependent on US. Most of which are too weak to stand or have the elites that just want to make extra profit for their "donors".
13. US population is so dependent on the food stamps , medicare and similar programs that the public debt is getting out of control. Since entire countries are crippled by loss of industry, especially since just about everything they buy creates more jobs abroad not at home. Plus since hundreds of billions of $ are going abroad the government has to print more money, what wobbles the entire system.
14. As the deregulation ideology settles in USA completely the food security/quality is also targeted. Therefore other developed countries start to impose food embargo on US foods since it no longer matches even the most basic health standards. However dictatorships don't have a fundamental problem with such food to feed their poor and therefore make US tightly dependent on their market. Since this is the only possible export market and there have to be exports at all cost since the loss of most factories was socially catastrophic.
15. Authoritarian countries start military expansion in order to be more openly influential all over the world. Since sucking out the economy wasn't enough for them. For this reason military spending of USA and similar countries has to go up to keep the ratios as they are.
16. Most of US public don't have the money to really afford their life and military is taking bigger and bigger part of the cake as global world order changes. Since the main industrial engine has shifted to the eastern hemisphere. Which has wages, democracy and environments that democracy can't match because people would rebel.
17. Since American public is quickly losing purchasing power they start to demand Medicare for all since most can't really survive without such aid. Plus the number of untreated individuals starts to take extra tool on economic competitiveness and mental health.
18. China is becoming even more bolder and uses it's economic might to return Communism into ex-communist countries in Europe, which were never truly made democratic. Thus it lower US exports and it takes countries that are NATO allies slowly to their side by promising local elites that when China is in charge they can reintroduce the dictatorships, China doesn't care. What also opens serious security holes for the USA since those countries are important for US security and they know a few secrets due to military pact. Therefore military needs extra spending to fill in these holes.
19. Therefore under all these pressures that are just getting worse USA starts to implode internally in social, economic and political sense, since the current system simply can't be maintained. Since there are just too many problems all over the map. What greatly accelerates implosion of democracies all over the world to the point that USA is completely cornered and broke.
This is simplified picture of what happened and is happening but this is the core process. The mentality of "grass is always greener somewhere else" and "I don't owe anyone anything" has led to the scenario that the genie was released out of the bottle and now no one knows how to return it.
In a Libertarian society, the concept of "equality" doesn't exist, since its more survival of the fittest.
Correct, and who is the the most ruthless force on the map ? Communism.
Which is exactly why just about all Americans fear it. Since this is the force that can kill tens of millions of it's own people pretty much just for LOLs or some minor details. So now in 21th century libertarian greed is feeding this system since everything is allowed in the name of the profit. What will be the end of libertarianism since the monster will simply twist you, eat you and buy all of your friends.
Therefore since you voted for Trump you are for regulation not deregulation, since restoring national economy and the rule of law is regulation of global market (which is the most free market possible). Which is in order that CEOs can no longer do pretty much whatever they want (what libertarianism fundamentally favors). However since USA is retreating to do it's own "I don't care" thing at home they all leaving most of the world to China, together with future of the dollar, natural/rare resources, markets etc. What surely leads to economic implosion and spread of Communism. Explore why USA has spread around the world so much since ww2 and why that didn't have the real alternative through late 20th century.