In the wake of the war, Tamaulipas remained an object of interest to American expansionists. The climate was considered suitable for the spread of slavery by Southerners who desired the admission of new territory to shift the balance in Congress back towards the slave states. Senator Albert Gallatin Brown declared "I want Tamaulipas, Potosi, and one or two other Mexican states; and I want them all for the same reason - for the plantation and spreading of slavery". In the 1850s José María Jesús Carbajal led several incursions into Tamaulipas before being indicted for violating the Neutrality Act. Filibustering efforts were also directed towards Cuba with the Lopez Expedition, which was desired for the same reason as Tamaulipas.