Question

which was a major weakness of the league of nations? it lacked its own military force to enforce decisions. it forced germany to accept full blame for world war i. it imposed harsh economic penalties on germany it allowed european borders without considering ethnic groups

Explanation:

The League of Nations, formed post-WWI, lacked its own standing military force. This critical weakness meant it could not enforce its decisions against aggressive nations, which was a major failure of the organization. The other options are incorrect: the League did not force Germany to accept full blame (that was the Treaty of Versailles), it did not impose French economic penalties on Germany, and it did not redraw European borders without considering ethnic groups (border adjustments were part of post-WWI treaties, not the League's core failure as a major weakness).

Answer:

It lacked its own military force to enforce decisions.