Why do you suppose Washington was so concerned about these issues?

Washington was deeply concerned about the issues of national unity and political factionalism because he believed that a divided nation could lead to instability and weaken the fledgling democracy. He understood that strong political parties could create discord and conflict, undermining the principles of the Constitution and the collective goals of the country. Additionally, as a leader during the Revolutionary War, he recognized the importance of solidarity in achieving independence and feared that divisions could threaten the progress the nation had made. His warnings in his Farewell Address reflected his desire to promote a stable and harmonious government for future generations.