Answer:
Y2K problem
Explanation:
Y2K problem is short for Year 2000 problem or also called millennium bug, was a computer program problem because the coding in the computer systems till 1990's was such that they save the years in two digits instead of four to save space. For example, the year 1998 was saved as '98'. It created an environment of fear among many government offices and data processing companies that the computers would stop working from mid night of 1 January 2000.
The United States was the last to join the Allied Powers because they did not want to be apart of the war. They joined the Allied Powers after Japan bombed Pearl Harbor.
your answer is A.) Over-Planting of wheat wore out the soil.
I am pretty sure it's Great Britain.