colonization and the struggle for women's rights

Bint Al Shamsa writes:

I have yet to see an American school textbook that mentioned women's rights Equal-Pay-No-Way without including the names and accomplishments of at least Susan B. Anthony and Elizabeth Cady Stanton. However, how many of them mention the fact that until Europeans colonized this country, women were already enjoying the rights that Stanton and Anthony fought for plus many more? Can you understand why that's problematic, at the very least?