It stemmed from the annexation of the Republic of Texas by the U.S. in 1845 and from a dispute over whether Texas ended at the Nueces River (the Mexican claim) or the Rio Grande (the U.S. claim).
Three main motivations for European exploration are the need to spread their religion (Christianity), improving the economy (acquiring more spices,gold,goods) and lastly, faster trading routes. Hope this helped :))
aincient rome set up a<u> republic </u>where citizens elected representatives to the senate to rule
