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Some of these plants may be native to the region before it became a city , some may have been brought there intentionally or unintentionally by people , and some may have been dispersed there by wind , water or animals . An important issue that began to concern the Greek authorities both in Greece and abroad by the end of the 1920s was that of illegal immigration . This year , thousands of children came to the United States from foreign countries , either adopted abroad by U.S. citizens or as potential adoptees . Numerous hydropower and water storage projects have been built which either block access to areas used historically by coho salmon or alter the hydrograph of downstream river reaches . These compounds are usually degraded rather poorly by the natural microflora .