In the excerpt, the limitation on the search of evidence on why united states entered into the first world war was that it expressed opposition to war with Germany.
As we know, the German invasion of countries and other Hitler's activities contributed to the outbreak of war in Europe.
In conclusion, the limitation on the search of evidence on why united states entered into the first world war was that it expressed opposition to war with Germany.
Read more about WWI
brainly.com/question/8535233