  In the hierarchical view of star formation, giant molecular gas clouds (GMCs)
undergo fragmentation to form small-scale structures made up of stars and star
clusters. Here we study the connection between young star clusters and cold gas
across a range of extragalactic environments by combining the high resolution
(1") PHANGS-ALMA catalogue of GMCs with the star cluster catalogues from
PHANGS-HST. The star clusters are spatially matched with the GMCs across a
sample of 11 nearby star-forming galaxies with a range of galactic environments
(centres, bars, spiral arms, etc.). We find that after 4-6 Myr the star
clusters are no longer associated with any gas clouds. Additionally, we measure
the autocorrelation of the star clusters and GMCs as well as their
cross-correlation to quantify the fractal nature of hierarchical star
formation. Young ($\leq$ 10 Myr) star clusters are more strongly autocorrelated
on kpc and smaller spatial scales than the >10 Myr stellar populations,
indicating that the hierarchical structure dissolves over time.
