Friedrich Trunp (the grandfather) ducked military service and was banished from Germany.
Historian finds German decree banishing Trump's grandfather
Royal decree ordered Friedrich Trump to leave Bavaria and never come back after he failed to do military service.
A historian has discovered a royal decree issued to Donald Trump’s grandfather ordering him to leave Germany and never come back.
Friedrich Trump, a German, was issued with the document in February 1905, and ordered to leave the kingdom of Bavaria within eight weeks as punishment for having failed to do mandatory military service and failing to give authorities notice of his departure to the US when he first emigrated in 1885.
... Trump was born in Kallstadt, now in the state of Rhineland-Palatinate, in 1869. He emigrated to the US aged 16 initially to escape poverty, attracted by the gold rush.
... Returning on a visit to Kallstadt in 1901, Trump fell in love with Elisabeth Christ, whom he married a year later, returning with her to the US. But when she became homesick and wanted to return to Germany, the authorities blocked his attempts to settle there.
In an effort to overturn the royal decree dated 27 February 1905, Trump wrote an obsequious letter appealing to Prince Regent Luitpold, addressing him as “the much-loved, noble, wise and righteous sovereign and sublime ruler”.
But the prince rejected the appeal and the Trumps left Germany for New York with their daughter on the Hapag steamship Pennsylvania on 1 July 1905. Elisabeth was three months pregnant with Donald Trump’s father, Fred.
https://www.theguardian.com/us-news/2016/nov/21/trump-grandfather-friedrich-banished-germany-historian-royal-decree
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