Imperial expansion was largely triggered by the quest of the imperial nations to want to know more about the unknown world and envoirment. The imperial nations took sea-faring adventures in order to reach places they never had knowledge of and in so doing were able to colonize these places. Also, the Fear of going beyond their known envoirments left the colonized nation limited in their knowledge of the world at large making them easier to colonize.
The Rio Grand River does NOT serve as a physical divider between Mexico and Canada. Instead it serves as part of the border between Mexico and the United States. The Rio Grande and the Rio Bravo del Norte are two different names for the same river TRUE.
