What is the most likely reason settlers followed the Oregon Trail and other trails whenheading west?

The internal combustion engine was an innovation of

What was the national government’s biggest concern if facing a war, under the articles of confederation? the national government had no national military. the country had grown too large to defend with a small army. the states would not back the federal government. there was no way the states would pay for fighting a war.

Which two sentences in this passage talk about china’s efforts to curb environmental degradation?