A few questions for @Libbi:
Why don’t the American Roshei Yeshiva shlita agree with you? They are not telling their Talmidim to marry at 21. Are you including these Rabbonim when you say “American Yankee Doodels” and “American Yeshivish Shotim?”
Why is it so hard for you to accept that American litvish boys are not the same as boys from Europe, EY or Chasisim? For better or for worse, we have different cultural norms. You can argue that we need to change the culture and prep American boys to “be ready” at 21. However, that is not your argument. (No, I am not saying that no 21 year old boys are ready get married, only that the vast majority are not.)
Do you really believe that insulting Americans by using phrases like “American Yankee Doodels,” “single girls are Agunos,” and “American Yeshivish Shotim” is going to help your cause? Do you really think you are going to name call and insult people to the point where they finally give in to you?
Lastly, which “Askonim proved that by boys waiting till 23 they are causing Agunas?” Anyone with minimal critical thinking skills and high school level knowledge of statistics realizes that the numbers your organization put out are juvenile and can not be relied on to make any serious conclusions.