How did the Spanish extend their northern buffer zone to the west In the 1760s? A. they colonized the California coast. B. they defeated the Navajos. C. they built forts in Texas. D. They established the Santa Fe Trail.

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

a phrase from a poem by ralph waldo emerson about the battle of lexington and concord. emerson's words read, “here once the embattled farmers stood / and fired the shot heard round the world.”