That was a short-term artifact of political realignments starting in the 1930s (New Deal Coalition) and—before that one had fully stabilized—1960s (Civil Rights).

Those overlapping realignments settled down into s new relatively stable alignment by the late 1980s; before the realignments most states were much stronger one-party states than the solid-red or solid-blue states today, and sometimes the second state party, if it existed at all, wasn't even the other major national party (Minnesota's Democratic-Farmer-Labor Party is a remnant of that: prior to the New Deal coalition, which it became part of and eventually joined the Democratic Party, the party competing with the dominant Republican Party in Minnesota was the Farmer-Labor Party, which was not associated with the Democrats.)

To be fair, there were only four elections in the previous 70 years that resulted in a Democrat winning. I think that avoiding something that like in the future is probably worthwhile, which is a minor argument against the electoral college based on past results.