How does early modern compare to high modern architecture?

Hyperion89 need help to clarify doubt about: : How does early modern compare to high modern architecture?
I’m a little confused about the differences between the two movements. Early modernism spanned from the mid-to-late 1800s to about 1920, while high modernism spanned from about 1920 to 1945. Any insight would be appreciated!

Try this:

Answer by MOZ
It revolves around the amount of simplicity of design vs. lavish, yet clean lines.

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