 Complete the following phrase:  The companys first major endeavor was its Liverpool Line, known as the Blue Swallowtail Line 18221880 from its distinctive blue and white swallowtailed house flag. This enterprise was originally started by Fish, Grinnell and Co. in cooperation with Thaddeus Phelps and was called the Fourth Line of Liverpool Packets. The Blue Swallowtail line originally sailed monthly and, like the other Liverpool-New York packet lines, did a thriving business in the wave of Irish immigration in the wake of 