A young demonstrator is attacked by a police dog in Birmingham, Ala., in May 1963. Scenes like these helped usher in the nation's landmark civil rights law, the 1965 Voting Rights Act. The Supreme Court will hear arguments Wednesday over a key provision of the law. Bill Hudson/AP hide caption

itoggle caption Bill Hudson/AP

International ships call at the busy Port of New Orleans. It's a major shipping convergence point on the Mississippi River. Ships come upriver from the Gulf of Mexico with imports from abroad, and barges come downriver, bringing U.S. goods for export. Debbie Elliott/NPR hide caption

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A clerk prices cigarettes at Discount Smoke Shop in Ballwin, Mo. The Food and Drug Administration, which must approve all new tobacco products or any changes to existing brands, has not cleared any products since assuming that responsibility in 2009. Jeff Roberson/AP hide caption

itoggle caption Jeff Roberson/AP

Maria Lola Melisio, 18, entered the U.S. illegally with her mother when she was 7. Now she's an undocumented resident living in Alabama, which has one of the country's toughest immigration laws. Debbie Elliott/NPR hide caption

itoggle caption Debbie Elliott/NPR