When and where will be the next worlds fair?

What was Cement Unloading Allowance associated with Rail Shipments from East of Mississippi to West of Mississippi? How did they named arches national park? How did a reef knot get its name? Is A group of rapids and small waterfalls is called? The Mexican government believed the border between Texas and Mexico was which river? What are the top ten states to have the most lighthouses? Is the Gulf of Mexico connected to the pacific ocean? What is source and mouth? Did Pavarotti ever perform at the Kremlin? How do density differences cause the large scale ocean circulation? When was John Quincy Adams elected into senate? Does llandudno is a seaside resort on the Pembrokeshire coast? Did the Tiber river help ancient Rome's growth? What is the purpose of a truss? What diplomats in the US and the UK arranged for the agreement on naval operations in the Great Lakes? What language did they speak at the Le Louvre? Is there beaver in the rainforest? What are the different farming methods in the Philippines? Why did the spanish propose the canal in the 1500s? How many years did it take to build Mount Rushmore?