The cause of the Green Revolution in India during the 1960s were due to many technological developments which industrialized agriculture. Land reform, new infrastructure, and utilization of advanced machinery were practices adopted during this time.
Answer:
Pollution and Population are correct
So, the United States wanted to find more opportunity in different places than where they were currently at. Of course they would go and expand their territory. United States pretty much bought out their way across the continent, with New Orleans and West Florida for $10 million as an example. They possibly fought for a bit of it, but most of it was bought out. :)
-Mabel <3