Some of what you will learn in the history and present day reality of the US is why their "melting pot" theory doesn't work worth a damn. Minority cultures have no protection against suppression and bigotry and why Canada's mosaic is a planned approach to cultures getting along peacably and not being exploited. ( we're not saints in that but the lesson has been learned and legislation puts the protections in. )
It is a world of difference. The ancestors ( my ancestors ) left PA and before that Netherlands and England to be able to peacably practice their religion without oppression. There a bullet holes in the family farm from the Fenians.
They found a place in Canada that they could live peacably....many were also loyal the British crown and left for that reason.
The US left Britain as they were oppressed, taxation without representation ....... the Brits treated them as colonials, like second class citizens instead of citizens of the British Empire .....so they blew their chance.
So if you want your history ...pay attention to the various cultures that made it and the forces that drove them.
Multiculturalism does not mean just seeing a bunch of cultures pasted together.....any big city on the planet offers that.
It means those cultures are celebrated and valued and supported by the governments as a policy at many levels and protected from exploitation.
Now if we could just do it better with first nations....
That should be one of the Smithsonian museums you visit....maybe shed a tear too for the genocide undertaken.