The United States has a rich history of supporting open access to research. Some of the earliest open access projects include ARPANET, the precursor to the Internet, and MEDLINE. Major current open access initiatives in the US include arXiv, an open access archive launched in 1991 that covers many fields of science; the Internet Archive, launched in 1996 to provide open access to web archives and collections; and PLoS, an open access publisher launched in response to the lack of open access from traditional publishers. Many US universities have also adopted open access policies or resolutions.