In what is today the southwestern united states, which successful farming strategy did early native american groups use?

a. large permanent settlements
b. trade with mesoamericans
c. complex irrigation systems
d. giant earthwork mounds

I believe the answer is: c, Complex irrigation systems

The terrain where native american live on had a different height in elevations which make it really hard for them to obtain water for their agricultural field. And yet, the natives manage to develop Complex irrigation systems that allow them to allocate the water from the higher ground into the all the agricultural fields in different elevation.

answer: secession

secession, as it applies to the outbreak of the american civil war, comprises the series of events that began on december 20, 1860, and extended through june 8 of the next year when eleven states in the lower and upper south severed their ties with the union. the first seven seceding states of the lower south set up a provisional government at montgomery, alabama. after hostilities began at fort sumter in charleston harbor on april 12, 1861, the border states of virginia, arkansas, tennessee, and north carolina joined the new government, which then moved its capital to richmond, virginia. the union was thus divided approximately on geographic lines. twenty-one northern and border states retained the style and title of the united states, while the eleven slave states adopted the nomenclature of the confederate states of america.

explanation:

thurgood marshall

explanation: in 1954, thurgood marshall and a team of naacp attorneys won brown v. board of education of topeka, kansas. in this landmark decision, the supreme court held that segregation in public education violated the equal protection clause of the fourteenth amendment.