KEENE -- President Barack Obama on Monday declared La Paz, the United Farm Workers union headquarters and onetime home of Cesar Chavez, a national monument and said it will help tell the story of "who we are as Americans."

The sun-splashed event at the longtime UFW compound was crowded with about 6,600 visitors, but many others were unexpectedly shut out. Organizers said too many people had responded to an email invitation.