如何了解这一VOA句子

题目

如何了解这一VOA句子
前文意思：十三殖民地与大不列颠开战,下面开始讲述当时黑人奴隶的态度.Details are not exact,but history experts say more blacks probably joined the British in the North than in the South.
是指南北方比较,北方更大比例的黑人加入了英国这一边?——而暗示南方有更多的黑人加入了殖民地这一边,还是说,南北方的黑人都倾向于加入英国,而北方的比例更大?如何了解,看懂这句话的结构?
完整的该部分前文：
Black slaves in the colonies also were divided about what side to join during the American Revolution.
Thousands fought for the British,because that side offered them freedom if they served in the army or navy.Some American states also offered to free slaves who served,and hundreds of free blacks fought on the American side.Many slaves,however,felt their chances for freedom were better with the British.Details are not exact,but history experts say more blacks probably joined the British in the North than in the South.
最后一句，就是问题里的那一句，是表达哪种意思？

答案

详情并不确切,但是历史学家们说,对比南方,可能有更多北方的黑人加入了英国这边.
因为不知道详细的语境,不知道究竟说的是什么情况,但是按照字面意思解释的话差不多就是这样.