Juan Ponce de Leon did exploration for SPAIN.
He was comissioned as governor of Puerto Rico by King Ferdinand. In 1513, Ponce de León led the first known European expedition to La Florida. He returned to Spain in 1514 and was knighted by King Ferdinand, who also reinstated him as the governor of Puerto Rico ( he got into problems with Diego Columbus - son of Christopher Columbus- who took away from him the government from Puerto Rico for almost two years) and authorized him to settle Florida
the Industrial revolution was the boom of factories to produce products such as clothes. The factories main use was cotton. When the demand for cotton increased the more cotton was needed to be produced in turn making agriculture rise slightly. Everyone benefited except the slaves. Another effect was the poor working conditions in the factory that led to a working class revolution
There were many reasons. For starters, it involved getting rid of a large number of Native Americans, and while some supported this, others opposed it as they were peaceful. Another thing was that this meant the introduction of new states and it deepened the division based on whether the states should be slave states or non-slave states. Also they involved war with Mexico and some wanted this and some didn't.