A. Europe's growing population and limited agricultural resource base.
B. competition among numerous small monarchies in Europe.
E. search for commercial advantage and economic gain.
Explanation:
The three reasons the Europeans set sail for the discovery of there lands were the sake of there economy, and religion and glory. As they wanted to improve there economy and make better use of the resources avail to them and they wanted to acquire more land and faster trading routes and in order to spread more of there religion.
To avoid dividing the US with political parties it would divide the US in 2 or more, take the election now for an example. The South and North are very divided as of right now.