Irrigation of crops led to salinization of the soil, Sumer was located on a flat plain that provided no natural barriers to invasion, and the land became too swampy to grow adequate crops.
the answer is to mobilize
Answer:
Explanation:
When the U.S government refused to respect the rights of the Five Tribes, they were left with little to no options. The Seminole carried onto war and the other tries emigrated.
D is the correct answer because the octopus was a challenge
