Parque México
... that Parque México in Mexico City exists because environmental laws in the 1920s did not allow housing to be built on a former racetrack?
... that <b id="mwDOM"><a href="./Parque_México" id="mwDOQ" rel="mw:WikiLink" title="Parque México">Parque México</a></b> in <a href="./Mexico_City" id="mwDOU" rel="mw:WikiLink" title="Mexico City">Mexico City</a> exists because environmental laws in the 1920s did not allow housing to be built on a former racetrack?