Part of the problem is your indentation is lousy, so you've no idea what lines up with what.

Part of the problem is you have NO functions in your program, just a bloated main with hundreds of lines of code.

Start with
Code:
void the_1980s ( ) {
}
void the_1990s ( ) {
}
void the_2000s ( ) {
}

int main ( ) {
    printf("Enter your choice:  ");
    scanf("  %d", &choice1);
    switch (choice1) {
        case 1: the_1980s(); break;
        case 2: the_1990s(); break;
        case 3: the_2000s(); break;
    }
}
Part of the problem is you have NO data. You should have arrays of data for things like presidents_1980s and movies_1990s.

Part of the problem is you seem to have just typed the whole lot in, only to find out that it doesn't compile.

Code:
    case (1):
      (printf("\n\nWhat would you like to see?\n");
That thing before the printf should be a brace, not a bracket.

A development process
Remember, compile early and often, and fix things as soon as you see them.