What was a major concern of scientists who left nazi germany for the united states before world war ii? they did not think germany was paying attention to their work. they did not think germany wanted to develop nuclear weapons. they feared germany was trying to develop nuclear weapons. they feared germany would pass the us in industrial production.

They feared Germany was trying to develop nuclear weapons.

Explanation:

Many Scientists left Nazi Germany after 1933, or Austria after 1938, (when it was annexed by Germany), or other countries that were invaded by Germany during World War II, either because they were Jewish or because they disagreed with the Nazi politics.

our current president donald trump