Please help me it is very important

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

Which is an example of a country that is overly dependent on another country for goods and sevices

Explain the importance of carnegie, morgan, and rockefeller on the american political scene of the early 1900's.