If this is for a class, this might not be the answer you’re looking for.
America has always been against immigration. Even as it was being built on the backs of immigrants from Europe, the colonists who were already here despised them. Xenophobia has been a part of American culture since it was founded. This long history with anti-immigration and nationalism coupled with white supremacy makes many Americans wary toward immigrants today.
There is no equation. I can’t answer without it
Their colonial experience led them to the point where they were sick of monarchistic European influence and wanted to create a fully democratic republic, created by the people for the people, not for the well being of a royal family.
C. they were worried that the new states could be pressured to allow slavery
The answer D is not true. Indeed, it started on june 1948 and ended on the 12 may 1949 !