Their would imply that it mentions a human. However, in this case, it's describing a nonliving thing, or "tomorrow." Their should only be used in the case of humans, or a grouping of humans.
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I think it means that when people actually stood up for slavery, if they stood up enough, they could be heard. If they did not though, then they would not be heard.?
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oh yeah sure I would rely like to
Climax, the highest point were the most dramatic thing happens to the beginning
