The land within the borders of current Portugal has been continuously settled and fought over since prehistoric times. The Celts and the Romans were followed by the Visigothic and the Suebi Germanic peoples, who were themselves later invaded by the Moors. These Muslim peoples were eventually expelled during the Christian Reconquista of the peninsula. By 1139, Portugal had established itself as a kingdom independent from León. In the 15th and 16th centuries, as the result of pioneering the Age of Discovery, Portugal expanded Western influence and established the first global empire, becoming one of the world's major economic, political and military powers.
What age did Portugal pioneer?
Age of Discovery

Seemingly, multitasking would cause a computer that is switching between several programs to run more slowly, in direct proportion to the number of programs it is running, but most programs spend much of their time waiting for slow input/output devices to complete their tasks. If a program is waiting for the user to click on the mouse or press a key on the keyboard, then it will not take a "time slice" until the event it is waiting for has occurred. This frees up time for other programs to execute so that many programs may be run simultaneously without unacceptable speed loss.
Multitasking would seemingly cause a computer to run in what fashion?
more slowly,

Tuvaluans are well known for their seafaring skills, with the Tuvalu Maritime Training Institute on Amatuku motu (island), Funafuti, providing training to approximately 120 marine cadets each year so that they have the skills necessary for employment as seafarers on merchant shipping. The Tuvalu Overseas Seamen's Union (TOSU) is the only registered trade union in Tuvalu. It represents workers on foreign ships. The Asian Development Bank (ADB) estimates that 800 Tuvaluan men are trained, certified and active as seafarers. The ADB estimates that, at any one time, about 15% of the adult male population works abroad as seafarers. Job opportunities also exist as observers on tuna boats where the role is to monitor compliance with the boat's tuna fishing licence.
What is the only trade union on Tuvalu?
Tuvalu Overseas Seamen's Union