Why was a new state constitution written in 1876

The Constitution of 1876 provided for the establishment of the University of Texas and made Texas A&M, which had been founded by the legislature in 1871, a branch of it. The constitution further required the legislature to establish an institution of higher education for the instruction of the black youth of the state

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 !