From a Tom Perez email about Democrats pulling off some firsts:

Jahana Hayes became the first African American women elected to represent Massachusetts and Connecticut, respectively, in Congress

Ilhan Omar and Rashida Tlaib are the first Muslim women to be elected to the House

Veronica Escobar and Sylvia Garcia are the first Latinas elected to represent Texas in the House

Sharice Davids and Deb Haaland became the first Native American women to be elected to the House

Jared Polis became the first openly gay governor elected in the country.