In the face of it,it is the poorer nation that depends on agriculture as the mainstay of their economy. In most poor economy, agriculture is the main employer and the breadline of many subsistence families.
The Americas had generally good soil. Cash Crops were planted.
Also, the more territory a country owned (still relatively true today) the more powerful it was(/is).
Number 3
Hope this helps:)
The answer is the legislative branch