On May 20th, U.S. President Donald Trump introduced a major new defence plan called the "Golden Dome." This project is meant to act as a shield to protect the United States from missile attacks. According to the president, the system will take around three years to build and become fully operational. To get things started, the government will invest $25 billion. Over time, the entire project could end up costing as much as $175 billion. Trump described the "Golden Dome" as a big step toward keeping the country safe from threats in the future.