The economies of both regions were more globally interconnected than ever during world war I 1 but the U.S was more dominant than Europe.
After the war, the world economy started to deteriorate. In the years 1918–19 the United States experienced a slight economic decline, although the second half of 1919 saw a slight comeback. The world economy collapsed extremely quickly in 1920 and 1921, causing a more severe recession in the United States.
Thus, One explanation was simply that Americans had stronger ties to Britain and France than to Germany and Austria on the whole, with some ethnic minorities being exceptions. It was obvious that Britain and France were running out of resources by 1917, and the United States felt strongly about defending its longtime allies.
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