Central Illinois
... that Caterpillar Inc. employs 4,000 Central Illinois workers at its Peoria headquarters?
... that <a href="./Caterpillar_Inc." id="mwDcs" rel="mw:WikiLink" title="Caterpillar Inc.">Caterpillar Inc.</a> employs 4,000 <b id="mwDcw"><a href="./Central_Illinois" id="mwDc0" rel="mw:WikiLink" title="Central Illinois">Central Illinois</a></b> workers at its <a href="./Peoria,_Illinois" id="mwDc4" rel="mw:WikiLink" title="Peoria, Illinois">Peoria</a> headquarters?