At the coast fisherman used nets to catch fish. The geography of the Mayan civilization affected them a lot. For example, Mayans wouldn't be able to trade things like obsidian if it wasn't in their area. Mayans wouldn't be able to grow very good crops if there were no rainy seasons and fertile soil.
Imperialism is aiming towards creating an empire. Someone taking control over themin that way would possibly cut off the resource volume. It let to slave trade and damaged many cultures.
