Who were nativists?
transcendentalists who wanted to live in nature, away from urban centers
americans who wanted to revive the cultures of the nation’s original inhabitants
children who were born in the united states to immigrant parents
americans who believed that too many immigrants were coming into the country

The Nativists were "Americans who believed that too many immigrants were coming into the country," since they considered themselves to be "Native," even though almost all of them were immigrants as well. 

The  pan-african movement  was an "emotional, cultural, psychological and ideological  movement  that began among the  african  dispora in the western hemisphere, for a closer  purpose, so that  african  people could feel secure, attain political, economic as well as psychological power visa vis other races or world regions" .

These islands/chinampas then provided rich soil for crops with easy access to water. i hope this is correct, im so sorry if its not !