It is time for opposition to the Annexation of Texas to cease.... Texas is now ours.... Let their reception into the "family" be frank, kindly, and cheerful (O)ther nations have undertaken ... hostile interference against us, ... h pering our power, limiting our greatness and checking the fulfillment of our manifest destiny to overspread the continent allotted by Providence (God) for the free development of our yearly multiplying millions.

California will, probably, next fall away from (Mexico).... Imbecile and distracted, Mexico never can exert any real governmental authority over such a country... The Anglo-Saxon foot is already on (California's) borders.... ?
armed with the plough and the rifle, and marking its trail with schools and colleges. courts and representative halls, mills and meeting-houses.... All this (will happen) in the natural flow of events...

After Texas, what is the next likely candidate for American annexation?

How can the United States ensure a successful transition for the new state?

The next likely candidate for American annexation is California. To ensure a successful transition for the new state, the United States should focus on providing economic and social support to the people of California. This could include providing access to education, healthcare, and other resources, as well as creating jobs and economic opportunities. Additionally, the United States should work to ensure that the rights of all citizens are respected and protected, and that the transition is peaceful and respectful of the culture and history of the people of California.