Answer:
The correct answer choice is Immigration
Explanation:
Immigration is definitely the factor that has contributed the most to the cultural diversity in both Canada and the U.S.
The United States has recieved, throughout its history, a very large amount of immigrants, from almost every part of the world: Italy, Germany, Ireland, Poland, Russia, Ukraine, the Middle East, Africa, Mexico, Cuba, Dominican Republic, and even Canada. This has created a very diverse culture, from Italian American culture, to Mexican American culture, to Jewish American culture.
A similar event occurrs in Canada, albeit a smaller extent until recent times. Canada in particular, received a large immigration from Ukraine in the past, and in recent decades, a large Chinese and South Asian immigration.
