Answer;
France
In the 1800s, Vietnam was colonized by the European country of France
Explanation;
-The European country of France colonized Vietnam in the mid 1800s. In 1885, the country planned to take over Vietnam and in the year 1887 they did exactly that.
-Consequently, they started integrating more Western ideals, education, and religion including, for the first time, introducing Christianity in Vietnam.
- France continued to rule Vietnam as a colony until their defeat in the First Indochina War and the proclamation of Vietnam's independence in 1954.