Also, at some colleges, for housing, you can put down a smaller housing deposit once you are accepted. In some cases, the earlier folks doing so get the first choices of dorms and rooms. So…this is something to consider.
If you get off of a waitlist, it’s possible you will have less options.
But really, I think this deadline question is more that you don’t understand the U.S college application and acceptance process. You need to read EVERY website for colleges of interest to you. These websites will have the deadlines for when applications for admission and financial aid MUST be received. And most also give an approximate date when notifications of admission or not will be sent. This varies by college so read each website for colleges of interest. Do not miss these deadlines by even a minute.