The answer is
B. Spain and the U.S. signed the Adams-Onis Treaty
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They paid off union leaders
Answer: climate
Explanation:
Climate could be seen as the long term version of weather. Here Davis CA's weather conditions are averaged over 15 years. Weather is temporary and changes over a short period of time say days, weeks or months. Climate however lasts for consideraly long period of time say 15 years like the question above.
It was the name of the boundary that divided Europe at the end of WW2