 approvals from 1939 to 2019 as the data source, it is demonstrated that US approvals are found to have a distinct S-shaped (trichotomized) long-range CHE structure : an 8-year (1939-1947) Stagnated (random; H of 0.5) , a 27-year (1947-1974) Emergent (time-varying persistent;
<clarity>  approvals from 1939 to 2019 as the data source, it is demonstrated that US approvals are found to have a distinct S-shaped (trichotomized) long-range CHE structure : an 8-year (1939-1947) Stagnated (random; H of 0.5) , a 27-year (1947-1974) Emergent (time-varying persistent;
 approvals from 1939 to 2019 as the data source, it is demonstrated that US approvals are found to have a distinct S-shaped (trichotomized) long-range CHE structure : an 8-year (1939-1947) Stagnation Period , a 27-year (1947-1974) Emergent (time-varying persistent;