Your essay is largely spelled correctly, but there are a few suggestions to improve clarity and correctness regarding terminology and phrasing. Here’s a revised version with minor edits:
The biggest challenge the nation faced in Reconstruction was abolishing slavery and granting former slaves equal rights. The government enacted the 13th, 14th, and 15th Amendments to abolish slavery and to help African Americans, including former slaves, gain civil rights. This was the biggest challenge because the South still did not agree with abolishing slavery. Groups like the Ku Klux Klan opposed the notion that African Americans should have civil rights. It was difficult to change rules and traditions that were unjust, especially when the South disagreed.
Key changes:
- "letting" was changed to "granting" for a more formal tone.
- "amendment" was changed to "Amendments" as the names of the amendments should be capitalized.
- Added a comma for clarity in the phrase "including former slaves."
- "that did not agree" changed to "opposed the notion" for more precise language.
Overall, the essay presents a clear argument, and with these adjustments, it will read more smoothly.