Can somebody help with the top and bottom one?

Which factor best suggests a cause for the urban problems shown in this table? (3 points) increasing discriminatory housing practices shifting population density gradients over time declining urban renewal efforts by city governments declining basic employment sector in industrial cities increasing gentrification efforts in the inner cities

What kind of contact did christopher columbus and native americans initially have?

How did europeans and africans displace native americans in north america’s predominant peoples?