Why did the united states follow a policy of unrestricted immigration for europeans during most of the 1800s?

What led to the environmental damage that caused the dust bowl? 1. desert winds emerging from the southwest 2. rotating crops every year and having fallow land 3.overplanting throughout the great plains 4.a year-long drought

Germany was unified as a result of a series of wars. which ofthe following wars was the last and resulted in the formation ofthe german empire? austro-prussian warbfranco-prussian wardanish war

What was “reborn” during the renaissance?