求翻译：早先美国的硬币都是由白人组成的，有了水牛镍币之后，美国的硬币头像也开始出现三个印第安人，可以说，在一定程度上说明美国的包容性向前跨进了一大步，正如第一位黑人总统奥巴马一样。是什么意思？

Earlier U.S. coins are formed by the whites, with the buffalo nickel, U.S. coins picture began to emerge three Indians, it can be said, to a certain extent, that the United States of inclusive forward a major step forward, as Barack Obama as first black president.

正在翻译，请等待...

正在翻译，请等待...

Early United States coins are made up of white, after Buffalo Nickels, United States coin portrait of three Indians are starting to appear, it can be said, to a certain extent description United States inclusive of a major step forward, as the first Black President Barack Obama.