Why did Germans begin to look to extremist leaders during these times of political and economic
trouble?

They promised big things and seemed like they could make it happen. Thats on top of the fact that they grew rabid fan bases that would ignore the fact that they were actively hurting them instead of helping them.

Explanation:

albany plan of union, 1754. the albany plan of union was a plan to place the british north american colonies under a more centralized government

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.