Why were the framers of the constitution concerned about concentrating government power in one place?

They understood how too much authority in the hands of one person can cause austere manipulation and governmental problems. The colonies had just won autonomy from such a system, and really, there were not many other kinds of government around at the time. They sought to try something different while avoiding some of the mistakes of other nations.

Upheld the 1st amendment according to the u.s constitution. freedom of speech being limited in this case yes national emergencies

This sentence is true.