Madison in his writings and speeches warned against the "tyranny of the majority" in democracy or the ability for the majority in a democracy to rule however it pleased because its powered was unchecked. Therefore, Madison did indeed believe that tyranny was possible in democracy because of this notion or fear of majority rule.
The law in which prohibited the marriage between racial
groups that led to pacific islanders into marrying people in the tribal
communities was because of the anti miscegenation law. This law had enforced
racial segregation in which marriage or relationships are prohibited in races
that are different.
Southern and Eastern Europe. Hope this helps!