Historically, the state of texas has gone through periods of boom and bust primarily related to fluctuations in the price of the attempts made to diversify the state's economy have maintain area real estate values and financial fortunes in a time of international economic tumult.

Oil

Explanation:

The state of the Texas has its economic fortunes which are tied to rise and fall of price of the oil.

There was dramatic change in the economic growth in U.S. state of the Texas with discovery of petroleum reserves. When the prices of the oil were steadily rose, the state enjoyed boom, but when the oil prices declined, state suffered losses and tensions.

Thus, by attracting many other businesses, the state, Texas diversified its economy so not to rely on the oil sector independently.

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."

the most famous of all the units fighting in cuba, the "rough riders" was the name given to the first u.s. volunteer cavalry under the leadership of theodore roosevelt. roosevelt resigned his position as assistant secretary of the navy in may 1898 to join the volunteer cavalry. the original plan for this unit called for filling it with men from the indian territory, new mexico, arizona, and oklahoma. however, once roosevelt joined the group, it quickly became the place for a mix of troops ranging from ivy league athletes to glee-club singers to texas rangers and indians.