Writing Script matters as much as the spoken language
Language isn’t just a means of communication but it is the medium of propagating culture. That’s why culturally Canada is similar to the USA while Mexico (and the rest of Latin America) to Spain. One huge advantage the USA has over Europe is that practically everyone speaks a single language. A Californian can fly 6 hours to New York City, and feel just at home, with the same language and thus, a similar culture.