This thread is talking about the Senate. The senate isn't gerrymandered. Both senators are state-wide races.
If you want to view it that way, you can view the senate as "pre-gerrymandered". But the last time that was an option was in 1959, and both of those are just "the entire area the US owned, but wasn't a state yet. To get senate gerrymandering, you have to go back to 1912 and the admission of New Mexico/Arizona.