What happened in 1877 that signified the official end of reconstruction?

The event that signified the official end of Reconstruction is : Federal Troops were withdrawn from the South

The main purpose of reconstruction was to fix the economic and social structure from the southern citizen which seemed to be less developed and stagnant. But the Southerners think that this was an effort made by the northerners to control the southern area so they heavily reject the reconstruction

The last sentence of the gettysberg address