Short stories by George Alec Effinger
Listing 3 stories.
A young man travels across a country in the midst of a race war that grows larger as different identity-based groups join the fight, until the sudden end of the conflict brings further confusion and strife.
A Black, American-born physicist ignores his colleagues' warnings about tampering with the timeline and— in an effort to alter a history of racism and violence towards his people—decides to change history himself.
Aliens land peacefully on Earth and promise to fix humans’ societal problems, but humans soon get so frustrated with them that they flee to other planets. The smaller Earth population ends up bringing positive change, but this emigration to other planets reveals that many other populations have fled these aliens for the same reason.