Industrialist <a href="https://en.wikipedia.org/wiki/Henry_J._Kaiser" id="mwmg" rel="mw:WikiLink" title="Henry J. Kaiser">Henry J. Kaiser</a> begins construction of Boulder Dam (now known as <a href="https://en.wikipedia.org/wiki/Hoover_Dam" id="mwmw" rel="mw:WikiLink" title="Hoover Dam">Hoover Dam</a>).