Final answer:
President Johnson's hesitation indicates the limits of his power as president to hold the Union together.
Step-by-step explanation:
President Johnson's hesitation indicates that there were limits to his power as president to hold the Union together. His reluctance to take strong action and his vetoing of congressional measures created a deep rift in Washington, DC, and hindered his ability to unite the country. Additionally, his beliefs in White supremacy further alienated those in Congress who sought to create equality between Black and White people.