Third world country XD what?? how are we becoming a third world country in any way, other than the greed of the corporations? For one they are polluting our rivers, land and skies causing our life expectancy to drop drastically, secondly they are driving millions of Americans into poverty and out of the middle class by way of automation and shipping jobs overseas.
Progressives also agree that the needs of American citizens comes first, however, not at the expense of other nations or their citizens. Which is a very important caveat, which stops the possibility of imperialism and other aggression, not to mention affirms the use diplomatic options and the facilitation of compromise.
I would like you to back up your statement of "almost no Americans supported Germany" with a source before I give it any credence. Also maybe use a better analogy than the abortion one, seeing as abortion being "okay" is not a fact, it is an opinion. It is a fact that Americans were Nazis and supported Nazi Germany, it is an opinion whether that number is insignificant or significant.
I'd recommend these articles on Americans supporting Nazi Germany:
https://time.com/5414055/american-nazi-sympathy-book/
https://www.globalresearch.ca/secret-history-the-u-s-supported-and-inspired-the-nazis/5439236
https://exhibitions.ushmm.org/americans-and-the-holocaust/us-public-opinion-world-war-II-1939-1941
http://www.thehistoryreader.com/modern-history/6-things-may-known-nazis-america/