B, but to be exact it was 1402
It was the completion of the Northern Pacific Railroad that mostly changed the feelings toward Chinese workers in Washington because the rail lines were so popular.
Internal terrorism and external terrorism both pose a great threat, but terrorism carried out by the United State's own citizens can be much more harmful in the long run. My favorite quote about this is nerdy, but it's from Captain America: Civil War and is stated by the true antagonist of the movie, "An empire toppled by its enemies can rise again. But one which crumbles from within? That's dead... forever." We as a people can rally against an outside threat and rise from whatever they may do to us, but we become exponentially weaker if we must rally against those within our own borders. That's just kinda my opinion.
Dred Scott v Sandford
Brown v Board of Education was about black people with white people in the same school
Roe v Wade was about abortion
There is no Missouri v the United States