Why did the northern senators oppose the black codes

States' compliance with the native american reservation treaties drawn up by the federal government for the native american nations is:

Historians have recently discovered a historical journal published in the early twentieth century. the journal contains facts based on original sources about the downfall of the early byzantium empire. historians consider this long-lost journal to be a breakthrough in their understanding of the byzantium empire. based on this information, the journal is a source.

Why did countries not allow jewish refugees asylum?