Not in the novel, but in my backstory notes I have:
"1895 British Guiana-Venezuela border dispute grows hot. British Navy shells Caracas and
British Marines land and capture the capital. Sumner confers with his cabinet and Congress,
then presents British ambassador with the ultimatum that British forces withdraw from
Venezuela or face a declaration of war from Texas. Britain refuses. Sumner asks for, and
receives, a declaration of war from Congress. Sumner resigns, as Texan law requires, and
joins Texan Army as a private. Begay is sworn in as President. Texan Navy attacks Georgetown and Jamaican/Texan forces storm and capture the British Naval base there, led by General Phoebe Ann Mosey of the Texas Marine Corps.
"1896 The war continues, with British counterattacks against Texas in Central America and Cuba. President Begay is assassinated by a British agent. Secretary of State James Jones Quarles is sworn in as President.
California enters war on Texan side, attacks and seizes Hawaii, which is at the time a British Pretectorate.
"Emperess Isabella of Brazil offers to mediate an end to the Anglo-Texan war. Treaty of Rio restores
British Naval base in Jamaica, but Britain must cede most of Guyana to Venezuela. Venezuela petitions
for statehood in Texas."
And that, I believe, is the last time Texas declared war on anybody.
Mosey is elected President in 1904 and 1907. You can buy a picture of her here:
http://www.laughingravy21.com/StoreFrontProfiles/DeluxeSFItemDetail.aspx?sid=1&sfid=80103&c=104201&i=195512336