Final answer:
Cameron County in Texas was purposefully divided to disenfranchise Hispanic voters, which undermined the Voting Rights Act of 1965 and was contested by organizations like MALDEF.
Step-by-step explanation:
The county in Texas that was purposely divided to disenfranchise Hispanic voters is Cameron County. Gerrymandering practices were used to dilute the voting power of Hispanic communities. These practices violated the Voting Rights Act of 1965 and were challenged by organizations such as the Mexican American Legal Defense and Education Fund (MALDEF). These actions were a part of larger systemic efforts to ensure that Anglo candidates won elections, even in areas with substantial Hispanic populations.