Question 1 of 20 This showed a pattern of different ethnic groups tending to
disproportionately concentrate in separate schools.

In this sentence, concentrate means to:
contemplate
congregate
concede
confide

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate

i think it’s a i hope that right : )

how they should count slave votes (three-fifths compromise), the state representation in congress, and how much power should be given to our national government.