Virtually no one is unemployed in the US because of the combination of international trade and minimum wage laws.
- Wage growth over time - Health outcomes - Savings rate - Credit card debt rate - Feelings about the future (are we on the right track/wrong track?)
The stats you mention are interesting but not relevant to OPs assertion that a wage floor in developed nations was problematic in a free trade world.
Also: things cost more in the US. You can't survive on 3rd world sweatshop wages in the US, even if they were permitted by abolishing minimum wage laws.
Very little, actually. Bus drivers need to buy more than bus tickets: even if you reduced their wages to third-world levels and reduced bus ticket prices to third-world levels, bus drivers still get sick and need to pay the doctor? Are you going to push doctor salaries down to third-world levels too? What about education, etc? At some point, you're just going to be pushing wages down across the economy and importing massive levels of inequality.
Expecting to people to take massive pay cuts and enact massive deflation in the name of market liberalism is frankly an ideologically-blinkered, impractical, stupid idea. It entails too much pain for little to no actual gain. The only people happy with the results would be a s small minority of oligarchs and ideological purists.