The answer to this question is C. In the 1800s mexico and the United states fought for territory near Texas, and eventually won after many engagements, such as the Alamo. Hope I helped.
Layer D is the oldest because it is the deepest.
Todos os ambientes na Terra mudam com o tempo.
Marxism, totalitarianism...Hmm, but i think it's dictatorship
To explore the vast, unexplored land and to start a new life with new opportunities.