What happened to the population of Texas between 1850 and 1860?

The first United States census was taken in 1850, when the Texas population comprised 154,034 whites, 397 free Negroes, and 58,161 slaves. The second United States census in 1860 gave Texas a population of 604,215. ... A 19.7 percent increase between 1940 and 1950 brought the population to 7,677,832.

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.