Jo, det förklaras i de senare romanerna (karaktärerna återfinns i grunden om tidigare Seldon Crisis-situationer, liksom deras lösningar), så jag vill inte förstöra det för mycket för dig. I varje fall, enligt Seldons design, är svaret nästan oundvikligt.

Jag har inte läst dem om några år, men som jag minns poängterar de första krisen:

(Headers att påminna dig utan att visa spoileren om det är tillräckligt - vill inte förstöra det roliga, om du läser igen :))

Maktbalans

Basically, they didn't try to fight them, but they made sure the enemies of the Anacreonians knew what was happening; their enemies couldn't risk one group having access to nuclear power, so a stalemate forced them all to leave the Foundation alone. I believe this is the 'obvious' one you reference.

Religion

Next they instituted a 'Religion' behind technology and used that to make fighting the foundation a 'Sin' with demonstrable results; the trained techs on other planets didn't really understand things, just know how to use them. The foundation retained the ability to put them under Interdict, at which point all of their foundation technology ceased working.

handel

The third one was simple; dependence via commerce. The Religious angle had played itself mostly out, as worlds were aware of it. But Hober Mallow stuck to the idea of trade alone protecting them. They provided a product that couldn't be had anywhere else, was better than what was available elsewhere, and forced the enemies into dependence on their product. A little 'planned obsolescence' and they had enemies that couldn't afford to make war against the Foundation, as they needed Foundation supplied tools to do so with.

Åh, jag borde nämna - det här är de yttre krispunkterna. Det var också interna på varje Seldon Crisis, men jag tror inte att du frågade om dem.