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John J. Lumpkin: Through Struggle, the Stars (Paperback, eng_GBR language, 2011) No rating

In 2139, a network of artificial wormholes has allowed humanity to reach nearby stars, where …

As this Reddit comment explains:

Through the Struggle, the Stars: Probably my favorite sci-fi story I've ever read. It's a near-future setting where the nations of earth have set up some fledgling interstellar empires using wormholes. Great read if you're a space nerd like me.