What is the central idea of Wheatley's "To His Excellency, General Washington"?

The poem, "To His Excellency, General Washington" is written by poet Phillis Wheatley was written addressing General Washington who was the commander in chief of North America army before the revolutionary war against Britain for independence. The main idea was of the poem is to describe the struggle of colonists for the independence against the British.

The poem pursue the colonists to continue the righteous fight for their independence and gave an indication for the revolutionary war. Basically the central theme or idea of the poem was reason of freedom from Britain.

She used several phrases in the poem to describe the desire of freedom. The Wheatley uses the 'Celestial Choir' as a poetical muse, which inspires the poet's (Wheatley's) writing. Wheatley provides a description of the 'goddess of Freedom.' The goddess comes down from heaven for the purpose of involving herself in the revolutionary war between the colonists and Britain. She referred olive tree as the symbol of peace.

So, the central idea of the poem is the pursuing freedom from Britain.