Below is an index of posts by decade:
1860s Posts
[catlist name=1860s numberposts=100 orderby=title order=asc]
1870s Posts
[catlist name=1870s numberposts=100 orderby=title order=asc]
1880s Posts
[catlist name=1880s numberposts=100 orderby=title order=asc]
1890s Posts
[catlist name=1890s numberposts=100 orderby=title order=asc]