Panama lies between North and South America. It has an area of 77,000 square kilometers with a population of 1,771,000. Its official language is Spanish. Its capital is the largest city. Panama City. Columbus visited Panama in 1502 on his fourth voyage(航海). It became Spanish colony (民地) at the beginning of the sixth century. In 1862, when Central America rose against Spain, Panama joined Colombia, which had already declared its independence (独立). It didn't break away from Colombia until the year of 1903 to become an independent republic. The Panama c is the country' s biggest economic asset (经济资源). Panama and the United States reached an agreement in 1997, which declared Panama would take over all the rights of the Panama C in 1999. Panama was a Spanish colony ________.