[frank ballenger]

There has always been disunity and diversity.
I was disbelieving about this but looked it up and yes, there are a lot of Protestant denominations in the US:

“the Center for Global Christianity at Gordon-Conwell Theological Seminary, which is evangelical Protestant , estimates that there are currently 47,000 denominations .”

47,000

[ealgeone]

Individual congregations are not counted as “denominations.” We do make note of the fact that many independent congregations are not a part of any denomination. If those churches were to form an independent network with a name, we would consider them a denomination. Using this method, we report 45,000 Christian denominations in the world in 2019.

For clarity on the issue. A very subjective definition.

[Widget Jr]

That 47,000 number exaggerates minor difference between churches.
Just How Many Protestant Denominations Are There?
We Need to Stop Saying That There Are 33,000 Protestant Denominations

The claim they are tens of thousands of Protestant denominations may be a completely fabricated number.
33,000 Protestant Denominations? No!

[Lou Foxwell]

But only if you define denomination as including every disgruntled parishioner who holds an alternate service in their home.