Final answer:
A key takeaway from George Washington's Farewell Address is his warning against partisanship and how it is still a major issue, along with his advice on foreign policy and the rotation of public officials.
Step-by-step explanation:
After reading George Washington's Farewell Address, a key takeaway that still represents a major issue for the United States is the warning against partisan rancor and the importance of maintaining national unity. Washington emphasized the dangers of political parties creating divisions that could weaken the nation's cohesive strength. He spoke of the necessity to avoid permanent alliances with foreign nations, an advice that continues to be debated in U.S. foreign policy today. Although temporary alliances and international diplomacy are pivotal, there are always concerns about being drawn into external conflicts and losing autonomy. Furthermore, Washington's call for regular rotation of public officials continues to be relevant given concerns over politicians staying in power for extended periods and the influence of money in politics.