Next250’s Declaration of Interdependence, a new art gallery that features Americans’ collective values and hopes for the future, will open in McPherson Square Thousands are expected to gather a block away from the White House today to unveil their vision for America’s future. At the Next250 All of US rally, held a week before the 250th anniversary of the country’s founding, organizers will launch their Declaration of Interdependence , an art installation featuring the collective values they believe should define the next 250 years of America’s story. The pledge – a take on the Declaration of Independence, the country’s founding text – aims to build a country where everyone can earn a living wage, have access to green spaces and feel safe in their communities, activists said.