Einstein applied for Swiss citizenship.
 Many countries (United Kingdom, Germany, United States, Canada) allow citizenship by marriage only if the foreign spouse is a permanent resident of the country in which citizenship is sought; others (Switzerland, Luxembourg) allow foreign spouses of expatriate citizens to obtain citizenship after a certain period of marriage, and sometimes also subject to language skills and proof of cultural integration (e
" Two years later, the Naturalization Act of 1870 would extend the right to become a naturalized citizen to include "aliens of African nativity and to persons of African descent"

