In the following account of the Welch revival of 1904, James Edwin Orr tells of how that revival began and how it spread to Canada and the US a year later.
If you want a sense for how the Holy Spirit works in true revivals, then you will gain from listening to Orr’s account. At one point, he compared Billy Graham’s revivals to the Welch revival just to show how much greater the work of the Spirit is in relation to planned revivals of man. …As Orr described how European societies were changed during the 18 months the Welch revival lasted, I thought of 2020 and how decadent the US has become. …However, inherent in Orr’s talk is the hope that the Welch revival began with the spiritual aspirations of one man – the Spirit used him to kick off a work of God. The Spirit of God can do that anytime He chooses.