Emma is conducting a research project on texas during the 1840s and 1850s. which keyword search should she use to find information about why slavery grew

The slave population in Texas grew in the 1840s and 1850s because of the vast cotton plantations which needed a great many laborers. The settlers intended to create a cotton empire in Texas.  

Question: Which keyword search should she use to find information about why slavery grew

history of slavery in Texas/ cotton economy

the answer is b. hope this !

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44