They combined their thoughts with those ideas
The British economy was already weak after WW1, so when the US stock market crashed, taxes were put on foreign imports. The value of British exports were halved, and many areas went into poverty (unemployment more than doubled) so Britain devalued their pound in 1931, which made goods cheaper and improved their economy.
Answer:
A. To irrigate the land and sell crops
Explanation:
To divert rivers and streams is an irrigation system used since the antiquity to irrigate crops and to extend the sowing areas, now the difficulty of water access and the low rainfall in Texas obligate them to use that system to avoid crop losses and to improve the production capacity, in consequence, to earn the most quantity of money per crop with the minimun investment and expenses.
The effect of foreign conflict on Americans support would be the War of 1812 where British captured Washington, D.C. and burned our White House, and also U.S. forces turn back a British attack on Baltimore. The good thing that came out of the conflict was gaining our "Star Spangled Banner" from Francis Scott Key.