Which of these countries (Australia, Canada, Russia, USA) is the most selective when accepting immigrants?

I have lived in Australia, Canada and the U.S.

Immigration laws are as follows.
Russia: Easy

Canada: Easy

U.S: Hard

Australia: Very Hard.

Cultural acceptance:

Canada: Most accepted (Canadian Culture is unique, not aggressive and way more accepting)

US: Accepted (Cultural Diversity)

Australia: Mixed (Yes racism is still rampant in the country)

Russia: Bad (specially if you are from the LGBT community)

The most selective country is Australia, They have a tough immigration system, and a tougher screening process. No tom dick and harry can enter Australia. They are good with breaking down the immigration population and bringing in the most talented ones to the country.

Source: https://www.quora.com/Which-of-these...ing-immigrants

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