This is wrong on many accounts.

1. The UK, France, US, Canada, and Australia all paled in comparison to the USSR, who killed 85% of the total Nazis killed during World War II. Many of these liberal countries, the US especially, had thriving trade with Nazi Germany and non-aggression pacts early on in the 1930s. The US even continued to do business in Nazi Germany during World War II by cloaking assets owned by Ford, Coke, etc. It isn't liberals, but communists that have been the most consistent and steady anti-fascists in history.

2. NATO isn't anti-fascist, it's anti-communist, and has been led by literal Nazis like Adolf Heusinger. There is no part of NATO that has been anti-fascist.

3. These liberal countries have always been authoritarian, as they are all dictatorships of capital.

4. They have grown economically thanks to the spoils of imperialism.

5. The Civil Rights Act was won by leftist agitation from leftists like Martin Luther King Jr, Malcolm X, and outright communists like the Black Panther Party relentlessly pushing for it. Liberals opposed it initially.

6. Same-sex marriage was pushed for relentlessly by leftists such as the Black Panther Party, Gay Liberation Front, and more, until liberals eventually conceded.

7. Universal Healthcare has been regularly pushed for through millitant organizing from leftists, liberals have been responsible for weakening or privatizing healthcare.

You don't really know what you're talking about.