Democratic presidential candidate Joe Biden on Tuesday tapped Senator Kamala Devi Harris as his choice for vice-president, making her the first Black woman on a major party presidential ticket in US history and providing him with a partner well suited to go on the attack against Republican President Donald Trump.

With social unrest over racial injustice rocking the country for months, Biden had been under increasing pressure to select a Black woman as his running mate. She is also the first Asian-American on a major presidential ticket...