4D Cityscape USA puzzle allows you to build the history of the USA over the 4th Dimension of Time. Starting with the base layer, our unique jigsaw play showcases the evolution of the USA - based on territorial expansion from the year 1783 to 1900’s.You then assemble the 2nd layer “modern” jigsaw map - which showcases the formation all 50 states in a time sequence based on each State’s date of established statehood. The third layer is constructed using the 4D Time Poster where 93 of the most famous US monuments & buildings are placed into the puzzle in the order that they were constructed.