Expressions (phrases, clauses, etc.)
throughout; over a period of ...; over a span of ...
Usually written using kana alonesee 渡る
そして、だからこそ、ほぼ百年にわたって、従業員はだれでも雇用者のところに行って、現金による賃金支給を要求できるようになったのです。And that's why for almost a hundred years, any employee has been able to go to his employer and insist on being paid in cash.
Also written に亘って【にわたって】