What was exchanged in the columbian exchange

The decision to annex hawaii was a controversial one

2. what was the significance of the british reform act of 1832? members of the middle class were permitted to run for parliament. members of the working class demanded and received better living conditions. voters were given the right to vote by secret ballot, farm workers, factory workers, and women were given the right to vote.

Why do many scientists suppose the land bridge theory of migration?