Avondale Mine Disaster
... that after the Avondale Mine Disaster, legislation was passed by the Pennsylvania General Assembly that made Pennsylvania the first U.S. state to have laws regarding mine safety?
... that after the <b id="mwCIo"><a class="mw-redirect" href="./Avondale_Mine_Disaster" id="mwCIs" rel="mw:WikiLink" title="Avondale Mine Disaster">Avondale Mine Disaster</a></b>, legislation was passed by the <a href="./Pennsylvania_General_Assembly" id="mwCIw" rel="mw:WikiLink" title="Pennsylvania General Assembly">Pennsylvania General Assembly</a> that made <a href="./Pennsylvania" id="mwCI0" rel="mw:WikiLink" title="Pennsylvania">Pennsylvania</a> the first <a href="./United_States" id="mwCI4" rel="mw:WikiLink" title="United States">U.S.</a> state to have laws regarding mine safety?