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Modals, or modal auxiliary verbs, such as may, might, could, should, and must are used before the infinitives of other verbs to add meaning connected with certainty or obligation or freedom to act.  Modals are not usually used to say (a) that something definitely exists or (b) definitely happened.  We use them to talk about things which we expect, which are not possible, which we want to happen, which we are not sure about, or which we think are necessary.  

It‌ ‌is‌ ‌one‌ ‌of‌ ‌the‌ ‌most‌ ‌isolated‌ ‌islands‌ ‌in‌ ‌the‌ ‌

world,‌ ‌but‌ ‌1,200‌ ‌years‌ ‌ago‌ ‌a‌ ‌small‌ ‌

double-hulled‌ ‌canoe‌ ‌filled‌ ‌with‌ ‌seafarers‌ ‌

from‌ ‌a‌ ‌distant‌ ‌culture‌ ‌landed‌ ‌on‌ ‌its‌ ‌beaches.‌ ‌

Over‌ ‌the‌ ‌centuries‌ ‌that‌ ‌followed,‌ ‌a‌ ‌

remarkable‌ ‌society‌ ‌developed‌ ‌in‌ ‌complete‌ ‌

isolation‌ ‌from‌ ‌the‌ ‌rest‌ ‌of‌ ‌the‌ ‌worl