This t-shirt, like most t-shirts made in the world, contains 100% American cotton.

这款 T 恤与世界上大多数 T 恤一样，含有 100% 美国棉。

And it was such a big industry here–such a big market for American cotton–that it helps contribute to the end of the Civil War.

这里的产业如此之大——美国棉花的市场如此之大——它为南北战争的结束做出了贡献。

Herbert had arrived late to this prospect, only beginning  his venture in 1868, but American cotton harvests remained poor, and so there was money to be made.

赫伯特对这一前景的认识较晚，直到 1868 年才开始他的冒险， 但美国棉花收成仍然不佳，因此有钱可赚。