January 29, 1919, Congress ratified the 18th Amendment, which prohibited the manufacturing, transportation and sale of alcohol within the United States; it would go into effect the following January.
The best option in terms of the Gentleman’s Agreement of 1907 would be that "<span>The United States would not segregate Japanese immigrants, and Japan would not allow further emigration to the United States," although it had less to do with segregation and more to do with not allowing more Japanese into the US. </span>
I believe the answer is it committed the colonies to being independent.
The answer should be A. Great Depression.