This site's teaching resources about Central America fit very nicely with Unit 2 (La enseñanza) of the textbook Comunidades: Más allá del aula (Pearson). In particular, Lección 6 talks about how education is influenced by culture. The lack of emphasis on Central America and US relations with that region is a good example of how "educational culture" determines what we do and do not teach/learn.
The city was founded on the western end of a treacherously marshy islet known as Manzanillo Island. As part of the construction of the Panama Railroad, the island was connected to the Panamanian mainland by a causeway and part of the island was drained to allow the erection of permanent buildings.
This graphic organizer is a great front loading or ending activity for American Imperialism. It covers American motives, Spanish American War, annexation of Hawaii, Panama Canal, Open Door Policy in China, along with the presidents Roosevelt, Taft, and Wilson.