そのため

そ

の

た

め

Meanings

usually written using kana alone

Conjunctive expression linking a cause or reason to a result. Used in both spoken and written Japanese.

だからN4
だから is casual and common in spoken conversation, while そのため is more formal and typical of written explanations.
それでN4
それで can simply prompt a listener to continue a story, whereas そのため explicitly marks a cause-and-effect relationship.
したがってN3
したがって is even more formal and logical in tone, often used in academic or business writing, while そのため fits everyday explanatory writing.
このため
そのため points back to a reason already mentioned earlier in the discourse, while このため highlights a reason just stated with a stronger sense of immediate consequence.

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ので
そのため is the standard, clearly written way to say 'for that reason,' while sentence-initial ので for the same meaning sounds dated or colloquial.
それゆえN1
そのため is a neutral, widely-used way to state a reason or result, less formal-sounding than それ故.

Compound of その (that) + ため (reason, purpose). The kanji 為 is sometimes used for ため, but the kana form is standard.