Although there is a certain Slavic look in some cases, many Eastern Europeans do look much like any other Caucasians. A lot of immigrants from Eastern Europe have ended up in other parts of the world like the US, UK or Australia, for example.
One of these children of immigrant parents is Yvonne Strahovski:
She was born Yvonne Jaqueline Strzechowski to Polish immigrant parents. However, she looks typically like an all-American woman and is frequently suggested for Carol Danvers.
Elizabeth Olsen has Norwegian ancestry on her father's side, so she herself isn't all American. Even her surname sounds Scandinavian.