What country had been involved in Vietnam for almost a century before the United States?Group of answer choicesFranceGermanyGreat BritainItaly

The country that had been involved in Vietnam for almost a century before the United States is France.

Explanation:

France began its colonial rule over Vietnam in the mid-19th century, specifically around 1858, when French forces invaded the region. Vietnam became part of French Indochina, which also included Laos and Cambodia. French involvement in Vietnam continued until World War II, after which a struggle for independence led to the First Indochina War, culminating in France's withdrawal in 1954.

While Germany, Great Britain, and Italy had various interests in the region, none had the long-term colonial involvement that France did. Thus, the correct answer is France.