Why do historians still consider it a valuable source, even though they know it is probably flawed and biased?

Which region was almost every country colonized by an imperial power in the 19th century

When president johnson vetoed a law that would extend the freedmen’s bureau, congress reacted by supporting the veto and closing the freedmen’s bureau. writing a new law to show support for the black codes. overriding the veto and expanding the agency’s powers. drafting a law to prevent african americans from voting.

Who led american forces in the battle of tippecanoe