What physical geographic feature slowed the spread of Islam into Southern Africa?

The Sahara  

Explanation:

It formed the southern boundary of Islamic lands in Africa, which made the empire stop at that physical barrier because traders and armies would have found it difficult to survive in the desert.

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answer: to put them in the gas chambers

explanation:

and rpe them

one of the main reasons was definitely slavery. back in 1861, republican abraham lincoln was elected and ended up being a major influence in the slavery business. slavery greatly affected the texas economy because back in 1845 during the annexation of texas, slaves became a big part of the texas population. many texans that were in favor of the secession influenced groups through party ties.