Christmas tree? Holiday tree?

since we talked about the Christmas tree, I've been confused about the freedom of religion and establishment things. when they built the U.S. over the new land, furthermore, when they came from england, the reason why they escaped from england was because they pursue the freedom of religion. but somehow, as history goes on and on, people in The U.S. started to think that The U.S. is the country of Christianity and celebrating on Christian events on public places. this facts is a little bit ironic. i feel like these actions are kind of invisible pressure to people who live in The U.S. and don't believe in Jesus. I have the same experience as it. when I was in military in Korea, it was the Chinese new years day and as usual, we celebrated it. but the problem was the way of celebrating is for Buddhist and all soldiers are supposed to take actions of the way of Buddhist. but as you know, Christian doesn't do thing like this and even don't bow to ancient. of course, it was allowed to soldiers that just standing at the set of table for celebration and pray. we could choose what to do in front of table. Korea is not the country of Buddhism. but we did it and we do now as well. I didn't believe any religion at the time, but i just did what Buddhist are supposed to do. definitely I felt pressure for that. what i want to emphasize is that if someone who has authority try to make his/her belief public so often, it is unfair and violation of freedom of religion. this is invisible pressure for other people.